//引入event模块
var events = require('events');

//创建eventEmitter对象
var eventEmitter = new events.EventEmitter();

//创建事件处理程序
var connectHandler = function connected(){
	console.log('连接成功');

	//触发data_received事件
	eventEmitter.emit('data_received');
}

//绑定connection事件处理程序
eventEmitter.on('connection',connectHandler);

//使用匿名函数绑定data_received事件
eventEmitter.on('data_received',function(){
	console.log('数据接收成功');
});

//触发connection事件
eventEmitter.emit('connection');

console.log('程序执行完毕');